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Web's oldest question and answer site. Operated by About.com.
Community-driven question and answer site.
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Online reference service from the Library of Congress.
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Study help platform for students. Focuses on PSAT, SAT, ACT, and math.
Active community providing online tutoring and answers to academic questions.
Database of how-to articles and videos.
Answers and advice articles for parents.
Wiki-based Q&A service from Answers.com.
Collaborative, wiki-based how-to manuals.
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